A constitutional referendum was held in Cuba on 15 February 1976, the first nationwide vote on the island since the Cuban Revolution. The new constitution was reportedly discussed at grass-roots level by 6,216,000 citizens, resulting in 60 of the 141 articles being modified. It was reportedly approved by 99.02% of voters with a turnout of 98%.
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Text from the Wikipedia article “Cuban constitutional referendum”, available under CC BY-SA 4.0.